	.text	
	.globl	start_pref_counter, read_CCNT, read_ASM
			
start_pref_counter:
			mcr p15, 0, r0, c15, c12, 0
	
			bx		lr
read_CCNT:
			mrc p15,0,r0,c15,c12,1
					
			bx		lr
read_ASM:
			mrc p15,0,r0,c15,c12,2
					
			bx		lr
